Final answer:
The reddish-brown color of the urine could be caused by the presence of blood, which can be a sign of a urinary tract infection or kidney stone. Other factors like certain foods, dehydration, and liver diseases can also affect urine color.
Step-by-step explanation:
The reddish-brown color of the urine could be caused by the presence of blood. Hemoglobin, which is a breakdown product of red blood cells, can give urine a reddish-brown color when there is bleeding in the urinary tract, such as in a urinary tract infection or kidney stone. Other factors that can affect the color of urine include certain foods, dehydration, and liver diseases.